Birth control acting weird

I’m on my 3rd month of using the pill and it’s been A1 I’m on a medium dosage of falmina. Like I love this pill but suddenly it’s been all weird. I take the placebos this week starting today but I’ve started spotting on days I’m not supposed to and getting cramps. What’s up with this? I got on the pill due to severe cramps and really heavy long periods.